Unable to activate Windows 10

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Symptoms

Unable to activate Windows 10, a similar error appears:

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Cause

User Account Control (UAC) confirmation window does not appear, even if the specific sound was played.

Resolution

Change UAC settings to Always Notify:

  1. Open the Control Panel.

    Right-click on Start menu and choose Control Panel or press Command+R combination on the keyboard and type:

    control
    

    then hit Enter.

  2. Click on User Accounts icon.

    NOTE: If your Control Panel looks like this:

    Click on User Accounts, then on User Accounts icon one more time.

  3. Click on Change User Account Control settings link.

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  4. Move the slider up to Always Notify.

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  5. Close UAC window and try to activate Windows one more time.

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